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| Putting a regression line on a scatterplot in SPSS needs to be done slightly differently using version 12.0 and above. A step by step guide to doing this may be found by choosing 'Chart Editing' and then going to page 14 of the pdf document found at http://www.calstatela.edu/its/docs/pdf/lspss12.pdf | == Putting a regression line on a scatterplot == Putting a regression line on a scatterplot in SPSS can be done using the interactive graph in SPSS. The syntax below draws a regression line using reading score to predict writing score. Fuller details are given [http://www.ats.ucla.edu/stat/spss/faq/scatter.htm here.] {{{ IGRAPH /X1 = VAR(READ) /Y = VAR(WRITE) /FITLINE METHOD = REGRESSION LINEAR LINE = TOTAL /SCATTER. }}} Alternatively you can run the following syntax which produces a scatterplot: {{{ GRAPH /SCATTERPLOT(BIVAR)=READ WITH WRITE /MISSING=LISTWISE . }}} To add the fit line, you need to open the graph editor (by double-clicking on the graph), and then select the Elements pull-down menu at the top, and then select Fit Line at Total. You just need to change the variable names in the above syntax examples substituting the variable names in your SPSS data for 'read' and 'write'. If you wish to produce separate regression lines fo individual subgroups defined by a factor e.g. group then the above syntax is easily adjusted as the below {{{ GRAPH /SCATTERPLOT(BIVAR)=READ WITH WRITE BY GROUP /MISSING=LISTWISE . }}} On the Elements pull-down menu (referred to as above) select Fit Line at Subgroups. |
Putting a regression line on a scatterplot
Putting a regression line on a scatterplot in SPSS can be done using the interactive graph in SPSS. The syntax below draws a regression line using reading score to predict writing score. Fuller details are given [http://www.ats.ucla.edu/stat/spss/faq/scatter.htm here.]
IGRAPH /X1 = VAR(READ) /Y = VAR(WRITE) /FITLINE METHOD = REGRESSION LINEAR LINE = TOTAL /SCATTER.
Alternatively you can run the following syntax which produces a scatterplot:
GRAPH /SCATTERPLOT(BIVAR)=READ WITH WRITE /MISSING=LISTWISE .
To add the fit line, you need to open the graph editor (by double-clicking on the graph), and then select the Elements pull-down menu at the top, and then select Fit Line at Total.
You just need to change the variable names in the above syntax examples substituting the variable names in your SPSS data for 'read' and 'write'.
If you wish to produce separate regression lines fo individual subgroups defined by a factor e.g. group then the above syntax is easily adjusted as the below
GRAPH /SCATTERPLOT(BIVAR)=READ WITH WRITE BY GROUP /MISSING=LISTWISE .
On the Elements pull-down menu (referred to as above) select Fit Line at Subgroups.